EP1834508B1 - Kommunikationsdioden-treiberschaltung - Google Patents

Kommunikationsdioden-treiberschaltung Download PDF

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Publication number
EP1834508B1
EP1834508B1 EP05718890A EP05718890A EP1834508B1 EP 1834508 B1 EP1834508 B1 EP 1834508B1 EP 05718890 A EP05718890 A EP 05718890A EP 05718890 A EP05718890 A EP 05718890A EP 1834508 B1 EP1834508 B1 EP 1834508B1
Authority
EP
European Patent Office
Prior art keywords
voltage
led
digital data
drive current
circuit
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP05718890A
Other languages
English (en)
French (fr)
Other versions
EP1834508A1 (de
Inventor
Lev Freilicher
Leonid Shvey
Tamir Shaanan
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Infra-Com Ltd
Infra Com Ltd
Original Assignee
Infra-Com Ltd
Infra Com Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Infra-Com Ltd, Infra Com Ltd filed Critical Infra-Com Ltd
Publication of EP1834508A1 publication Critical patent/EP1834508A1/de
Application granted granted Critical
Publication of EP1834508B1 publication Critical patent/EP1834508B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/11—Arrangements specific to free-space transmission, i.e. transmission through air or vacuum
    • H04B10/114—Indoor or close-range type systems
    • H04B10/1141—One-way transmission
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/11—Arrangements specific to free-space transmission, i.e. transmission through air or vacuum
    • H04B10/114—Indoor or close-range type systems
    • H04B10/116—Visible light communication
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/10—Controlling the intensity of the light
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/10—Controlling the intensity of the light
    • H05B45/14—Controlling the intensity of the light using electrical feedback from LEDs or from LED modules
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/37—Converter circuits

Definitions

  • the integrating unit 26 includes a switch 39 operated by the toggle unit 24, and a memory device 41 for providing the shift voltage SV(t) to the shift amplifier 22.
  • the memory device 41 includes a capacitive memory component 42 selectively strapped between the shift voltage limiter 27 and GND to provide the shift voltage SV(t), and a resistive memory component 43 in parallel to the capacitive memory component 42.
  • OFF digital control states resulting from I LED (t)>I N open the switch 39 to swiftly discharge the capacitive memory component 42 to decrease the shift voltage SV(t) via the resistive memory component 43.
  • FIG. 4 shows six Timing Diagrams TD1-TD6 at six circuit points labeled A, B, C, D, B and F for demonstrating the transient state response of the CLEC 11 to nine digital data pulses DP1, DP2, DP3, ...., DP9 pursuant to a long absence of incoming digital data pulses.
  • the liming Diagram TD1 shows the analog data voltage ADV(t) at the circuit point A corresponding to the arrival of the nine digital data pulses.
  • the Timing Diagram TD2 shows the shift voltage SV(t) at the circuit point B periodically decreasing stepwise from its maximum value SV max corresponding to the arrival of the nine digital data pulses.
  • Timing Diagram TD 15 shows how the LED drive current I LED (t) stabilizes around the nominal LED drive current I N within a small tolerance, as evidenced by the feedback voltage FV(t) being generally smaller than the reference voltage V REF , whereupon the shift voltage SV(t) slightly increases (see Timing Diagram TD12) but is cyclically greater than same whereupon the toggle unit 24 issues OFF digital control states to periodically open the switch 39 (see Timing Diagram TD16) for causing slights drops in the shift voltage SV(t) (see Timing Diagram TD12).

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Optical Communication System (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)
  • Electronic Switches (AREA)
  • Led Devices (AREA)
  • Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
  • Near-Field Transmission Systems (AREA)

Claims (7)

  1. Kommunikationsdiodentreiberschaltung (CDDC) (10) zum selektiven Beleuchten von wenigstens einer Kommunikationsdiode (CD) (16) als Reaktion auf eingehende digitale Datenimpulse, wobei die Kommunikationsdiodentreiberschaltung (10) Folgendes umfasst:
    wenigstens eine Kommunikationslichtemitterschaltung (CLEC) (11) mit einem Kommunikationslichtemitterzweig (CLEB) (14) mit wenigstens einer CD (16) und so ausgelegt, dass sie den genannten CLEB (14) mit einem theoretischen LED-Ansteuerungsstrom IN ansteuert, um die genannte wenigstens eine CD (16) selektiv zu beleuchten,
    wobei jede CLEC (11) der genannten wenigstens einen CLEC eine Treibereinheit (13) beinhaltet, die einen Verschiebungsverstärker zum algebraischen Überlagerungsaddieren einer pulsierten analogen Datenspannung ADV(t), die den eingehenden digitalen Datenimpulsen entspricht, und einer variablen Verschiebungsspannung Sv(t) zum Ausgeben einer pulsierten Ansteuerungsspannung DV(t) zum Ansteuern des genannten CLEB (14) mit einem pulsierten LED-Ansteuerungsstrom ILED(t) umfasst, um die genannte wenigstens eine CD (16) im Einklang mit den eingehenden digitalen Datenimpulsen selektiv zu beleuchten, und
    wobei jede CLEC (11) der genannten wenigstens einen CLEC eine Regelkreisrückmeldeeinheit (18) zum Abgreifen des genannten CLEB aufweist,
    dadurch gekennzeichnet, dass die Regelkreisrückmeldeeinheit (18) zum kontinuierlichen Überwachen einer pulsierten Überwachungsspannung MV(t) direkt proportional zu dem genannten LED-Ansteuerungsstrom ILED(t) konfiguriert ist, um die genannte Verschiebungsspannung SV(t) bis zu einer maximalen Verschiebungsspannung SVmax zu erhöhen, die geringer ist als eine Schwellenansteuerungsspannung, um die genannte wenigstens eine CD (16) nach einer langen Zeit ohne eingehende digitale Datenimpulse kontinuierlich zu beleuchten, mit Ausnahme einer intermittierenden, schrittweisen Abnahme der genannten Verschiebungsspannung SV(t) als Reaktion darauf, dass jeder einzelne eingehende digitale Datenimpuls dazu beiträgt, dass ein LED-Ansteuerungsstrom ILED (t) die Bedingung ILED(t)>IN erfüllt.
  2. Schaltung (10) nach Anspruch 1, wobei die genannte Rückmeldeeinheit (18) eine Umschalteinheit (24) mit einem Komparator (33) zum Vergleichen einer von der genannten Überwachungsspannung MV(t) abgeleiteten Rückmeldespannung FV(t) mit einer Referenzspannung VREF proportional zum theoretischen LED-Ansteuerungsstrom IN aufweist, um einen digitalen Einschaltsteuerzustand unter der Bedingung ILED(t) <IN und einen entgegengesetzten digitalen Ausschaltsteuerzustand als Reaktion auf jeden einzelnen eingehenden digitalen Datenimpuls auszugeben, der dazu beiträgt, dass ein LED-Ansteuerungsstrom ILED(t) die Bedingung ILED (t) >IN erfüllt.
  3. Schaltung (10) nach Anspruch 2, wobei die genannte Umschalteinheit (24) ferner ein Tiefpassfilter (LPF) (32) zum Formen von allgemein rechteckigen Impulsen der genannten Überwachungsspannung MV(t) zu allgemein dreieckigen Spannungsimpulsen aufweist, um die Dauer zu bestimmen, für die die genannte Umschalteinheit (24) die genannten entgegengesetzten digitalen Steuerzustände unter der Bedingung ILED (t) >IN ausgibt.
  4. Schaltung (10) nach einem der Ansprüche 1 bis 3, wobei die genannte Rückmeldeeinheit (18) eine Integriereinheit (26) mit einem Speichergerät (41) aufweist, um die genannte Verschiebungsspannung SV(t) zu erzeugen, wobei das genannte Speichergerät (41) eine Speicherkomponente (42) zum kontinuierlichen Erhöhen der genannten Verschiebungsspannung SV(t) unter der Bedingung ILED(t)<IN aufweist.
  5. Schaltung (10) nach Anspruch 4, wobei die genannte Speicherkomponente (42) eine kapazitive Speicherkomponente ist.
  6. Schaltung (10) nach Anspruch 5, wobei das genannte Speichergerät (41) eine Widerstandsspeicherkomponente (43) zum selektiven Entladen der genannten kapazitiven Speicherkomponente unter der Bedingung ILED(t)>IN aufweist.
  7. Schaltung (10) nach einem der Ansprüche 1 bis 6, wobei der genannte CLEB (14) einen an Masse gebundenen Abtastwiderstand (17) aufweist und die genannte Umschalteinheit (24) den genannten Abtastwiderstand (17) anzapft, um die genannte Überwachungsspannung MV(t) kontinuierlich zu überwachen.
EP05718890A 2005-01-06 2005-03-20 Kommunikationsdioden-treiberschaltung Expired - Lifetime EP1834508B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US64189605P 2005-01-06 2005-01-06
PCT/IL2005/000317 WO2006072929A1 (en) 2005-01-06 2005-03-20 Communication diode driver circuit

Publications (2)

Publication Number Publication Date
EP1834508A1 EP1834508A1 (de) 2007-09-19
EP1834508B1 true EP1834508B1 (de) 2008-11-12

Family

ID=34963201

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05718890A Expired - Lifetime EP1834508B1 (de) 2005-01-06 2005-03-20 Kommunikationsdioden-treiberschaltung

Country Status (8)

Country Link
US (1) US7570235B2 (de)
EP (1) EP1834508B1 (de)
JP (1) JP4755187B2 (de)
CN (1) CN100553390C (de)
AT (1) ATE414401T1 (de)
CA (1) CA2576711C (de)
DE (1) DE602005011053D1 (de)
WO (1) WO2006072929A1 (de)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
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EP2219305B1 (de) * 2007-10-24 2018-11-07 Kabushiki Kaisha Audio-Technica Infrarotsender
EP2101424B1 (de) 2008-03-10 2013-02-27 Siemens Aktiengesellschaft Verfahren und Vorrichtung zur optischen Übertragung von Daten
US7952293B2 (en) * 2008-04-30 2011-05-31 Lsi Industries, Inc. Power factor correction and driver circuits
US8432108B2 (en) * 2008-04-30 2013-04-30 Lsi Industries, Inc. Solid state lighting, driver circuits, and related software
US7994730B2 (en) * 2009-06-04 2011-08-09 Apple Inc. Pulse width modulation (PWM) closed loop LED current driver in an embedded system
US8912732B2 (en) 2010-06-10 2014-12-16 Maxim Integrated Products, Inc. Current sensing for LED drivers
US8917034B2 (en) * 2012-05-31 2014-12-23 Fairchild Semiconductor Corporation Current overshoot limiting circuit
DE102013222177A1 (de) * 2013-10-31 2015-04-30 Tridonic Gmbh & Co Kg Leuchtmittel-Betriebsschaltung mit getaktetem Konverter zum digitalen Einstellen einer Farbtemperatur und/oder eines Dimmpegels

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Also Published As

Publication number Publication date
CA2576711A1 (en) 2006-07-13
US7570235B2 (en) 2009-08-04
US20070104075A1 (en) 2007-05-10
DE602005011053D1 (de) 2008-12-24
JP2008515218A (ja) 2008-05-08
JP4755187B2 (ja) 2011-08-24
CA2576711C (en) 2010-04-13
CN101040568A (zh) 2007-09-19
EP1834508A1 (de) 2007-09-19
CN100553390C (zh) 2009-10-21
ATE414401T1 (de) 2008-11-15
WO2006072929A1 (en) 2006-07-13

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